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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '987aded36c17b0eda5e1a488343dd4041649173ba997629d1adba2f1023daff8' 
  AND token = 'DqkGnb3eZK+hvrZ6Kc4aXsfObJ1TNMdAdimCAubn+M8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}